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paired fins that consist of a long, fleshy, muscular lobe; supported by central co-jointed bones
chorion - allows oxygen entry
amnion - fluid-filled cavity
yolk sac - provides food
allantois - excretes waste
groups of organs that cooperate to perform the major activities of the body; vertebrate body contains 11
bone cells; remain alive in a matrix hardened with calcium phosphate; communicate through canaliculi
do not conduct electrical impulses; support and insulate neurons and eliminate foreign materials in and around neurons
muscle or gland that increases or decreases activity to bring internal conditions back to set point
have "push-pull" action; increase activity of one, decrease activity in other
enhance a change; examples include blood clotting and contraction of uterus during childbirth
found in cnidarians and flatworms; has only one opening and no specialized regions
also known as the ventriculus; muscular chamber that uses ingested pebbles to pulverize food
has convoluted surface, allowing for expansion; contains extra layer of smooth muscle for mixing food w/ gastric juice
consists of duodenum, jejunum, and ileum; epithelial wall is covered w/ villi which are covered w/ microvilli
reassembled fatty acids and monoglycerides that have diffuesd into epithelial cells; enter lymphatic system before the circulatory system
cellulose digested in cecum; single-chambered stomach; regurgitation not possible
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